Quality and quality management have gained importance in the construction industry
also due to losses of life and property. For high-quality buildings, the amount of
defects during the construction works must be reduced. Thus, it is important to
determine the defects which lead to low quality in the construction projects / and
architectural, structural and constructional standards to measure some indicators of
quality like workmanship, design of components and usage of correct and highquality
materials. Therefore a systematic approach is required to achieve good
standards both in design and construction. CONQUAS quality assessment system
and Six Sigma quality management system are systems that could provide this
systematic approach.
The objective of this research is to evaluate the quality in mass-housing projects via
Six Sigma. Thus, level of construction quality of the three houses in ODTÜ / KENT
housing units in Turkey were assessed through Six Sigma with the contribution of
CONQUAS quality assessment system. CONQUAS was used for determination of
standards, whilst Six Sigma was used for data analysis. After the evaluation of
interviews with contractor, site-supervisor, occupants and visual observations,
defects and their reasons were determined. Reasons of poor quality in ODTÜ / KENT
housing units were listed as firstly poor workmanship, then improper or of poorquality
material usage and lastly problems in design of detailing.
Despite different construction dates of units studied, the results show that nothing
was learned from the previous mistakes and same defects were repeated. This
shows the importance of a system providing feedback and evaluation of quality
level of a construction project and quality improvement efforts of the contractor, and
measuring the progress over time like Six Sigma.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12607747/index.pdf |
| Date | 01 September 2006 |
| Creators | Celiknalca, Fatime Feryal |
| Contributors | Ozkan, Soofia Tahira Elias |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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